Wheel-feed for grinding-machines.



U. H. NORTON. WHEEL FEED FOR GRINDING MACHINES.

APPLIGATION FILED JUNE 19. 1909.

1 1 Q0 1 2 w u d .w mu m a P dos UNITED STATES PATENT OFFICE. Q

CHARLES H. NORTON,'OF WOBCESTER, MASSACHUSETTS, ASSIGNOR TO NORTON GRIND- ING COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHU- SETTS.

WHEEL-FEED FOR GRINDING-MACHINES.

Specification of Letters Patent.

Application filed June 19, 1909.

Patented Jan. 24, 1911. Serial No. 503,156.

This invention relates to a feed for the wheel of a grinding machine.

As new operated when grinding machines are used for grinding crank-shafts the work is not fed longitudinally, but the wheel is moved laterally directly up to the work,

and in this case the operator's hands are.

both busy so that he is unable to control the 7 feed of the grinding wheel except through the automatic arrangements withwhich these machines are usually provided.

The. principal ob ect of this invention is "to provide a simple and convenient mechamsm takingup very little room by which the operator can personally control the feed of the grinding wheel without using his hands for that purpose. 7

Further objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawing, in which Figure 1 is a front view of a portion of a grinding machine showing this invention applied thereto; Fig. 2 is an end view of a portion of the same; and Fig. 3 is a trans.- verse sectional view of part of the grinding machine to which the invention is shown as applied;

This grinding machine is'illustratcd as comprising a bed 10 on which the work cen- 'ters 11 are supported. On these work centers is carried the crank shaft or other work which is to be ground. Mounted on the bed is a support or casing 12 for the grinding wheel 13 and this is movable directly toward and from the work by means of a not 14 and a screw 15. This screw is operated by a gear 16 which in turn is operated by a pinion 1.7 connected with a ratchet wheel 18. Thisralchet wheel is shown as provided with a handle 19 and micrometer adjustment 20 butthese do not constitute apart of this invention. Mounted on the bed near the ratchet Wheel are ways 21 for a sliding block 22 carrying a pawl 23 which as-it moves up slides freely over the teeth of the ratchet wheel and operates the latter as it in the art without departing moves down. For operating the block 22 an arm 27 is shown pivoted on the frame at 26 and having thereon an adjustable block 27 provided with an adjusting screw 28 connected with a forked link 29 having a 'ack 3O thereon meshing with a pinion 31 on a crank disk 32 which is connected with the block by a pitman 33. Also mounted on the arm 25 out beyond the block 27 is a fixed pin 35 which is received in a slot 36 in a head 3? adjustable on a link 38. This link slides in guides 39 on the bed and is connected with link-work shown in the prescnt instance as comprising a bell-crank -10 and link 41. The link-work isconnected with a trcadle 12 which is mounted in bearings supported by the bed, one of which is .located on a bracket 43 mounted at the bottom of the bed. This bracket extends up at the end of the treaglle and projects out wardly from the bed and carries a spring 41 which is connected with" the lrcadlc and which is intended to .normally keep it inraised position.

When the treadle is depressed it moves the link 38 to the left carrying with it the link 25). This moves the pawl :23 upwardly and allows the same to pass idly over the teeth of the ratchet wheel. thus having no cli'ccton the grinding wheel. Then when the foot is removed the spring acts to return the treadlc to normal position which pulls down the pawl and yieldingly turns the ratchet wheel and moves grinding wheel. in this way it has been found in practice that a very large amount of time is saved, mrlicularly in the grinding of crank-shafts and similar articles which are ground in the same way, and that the operation of this kind of a wheel feed does not take the attcntion of the operator away from the Work which he has to perform with his hands in grinding articles of this character.

While I have illustrated and described a preferred embodiment ofthe invention I- am aware that many modifications thereof can he made therein by any erson skilled fi om the scope of the invention as expressed in the claims. Therefore I do not-wish to be limited to all the details of construction shown and described but What, I do claim is In a grinding machine, the combination with the bed, a grinding wheel movable laterally on the bed toward and from the Work, an arm pivoted on the bed, and means connected with said arm for feeding the grinding wheel when the arm moves, of a sliding link connected with the arinand guided on the bed, and a foot-treadle conneeted'witl said link and pivoted on said frame.

In a grinding machine, the combination with the bed, a grinding wheel movable thereon, and means for adjusting the grindingwheel toward and from the work, said means comprising a rotatable toothed wheel, and a movable pawl for turning the wheel when it moves in one direction, and an arm pivoted 'on the bed and having means thereon for operating the pawl, of a link pivoted on the arm, a foot-treadle mounted near the bottom of the-bed and so connected with the link as to cause the pawl to move idly over .the wheel in one direction when the foot-treadle is depressed, and a spring for raising the foot-treadle andmoving the link so as to give the pawl its operative stroke on the ratchet wheel 3. In a grinding machine, the combination with the bed, a grinding wheel movable thereon, a ratchet; wheel and a pawl for. operating it, of an arm pivoted on the bed, a link adjustably connected with said arm and adapted to operate the pawl as the arm swings, a pin on the-end of the arm, a link having an adjustable head provided with an I open bottomed notch for engagingover the pin to transmit motion tothearm, the con? nection of the first named link and arm being between/the pin and pivot thereof, and afoot-treadlel-for operating the last named link. t

4. In a. grinding machine, the combination with a bed, a grinding wheel movably iiiouhted thereon, and means on the bed I -for adjusting thegrinding wheel toward and from the work, of an arm pivoted on the bed, an adjustable block on the arm,

means connected with said block for operating the wheel-adjusting means, a levera e system connected with said arm beyond "stud block, a bracket 011 the bottom of the bed, a

treadle on the bracket connected with said leverage system, said bracket having an ,-1 1pwardly projecting portion extending out at.

the side of the foot-treadl and a spring depending therefrom and connected with the toot-treadle to return it to normal position. 5

In a grinding machine, the combination with the bed, a grinding wheel movable laterally on the bed toward-and Irom the work, an arm pivoted on the bed, and means connected with said arm for feeding tl', 42 5a the work, and a tretidle for'distending thql l5 yielding means; i

In testimony whereof I have hereunto setmy hand, 111 the presence of two subscribing witnesses. I

CHARLES II'NGRTONI Witnesses -Annnn'r E. Far, J. Emmi: II'iXLL.

the grinding 

